65366954640 has 400 divisors, whose sum is σ = 252389846016. Its totient is φ = 15570662400.

The previous prime is 65366954623. The next prime is 65366954659. The reversal of 65366954640 is 4645966356.

65366954640 is a `hidden beast` number, since 6 + 5 + 36 + 69 + 546 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2598925 + ... + 2623955.

Almost surely, 2^65366954640 is an apocalyptic number.

65366954640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65366954640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126194923008).

65366954640 is an abundant number, since it is smaller than the sum of its proper divisors (187022891376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65366954640 is a wasteful number, since it uses less digits than its factorization.

65366954640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25100 (or 25085 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 54.

The spelling of 65366954640 in words is "sixty-five billion, three hundred sixty-six million, nine hundred fifty-four thousand, six hundred forty".